Door lock



N. B. HURD June 24 1924 DOOR LOCK 2 Sheets-Sheet 1 Filed March 50. 1 925 S v v8 INVENTOR ATTOR EY} June 24 1924. Q 13498.}5'49 N. B. HURD I DOOR LOCK Filed March so. 1923 2 Sheets-Shet:.2

v 4 44701110110 VIII/II/I/I/II/ZQ v IN VEN TOR ATTORNEy Patented June 24, 1924.

UETEEP PT? NORMAN B. EUBD. OF NEVJ BRITAIN, CONNECTICUT, ASSIGNOR TO THE AJVIERICAN HARDWARE CORPORATION, OF NEW BRITAIN, CONNECTICUT, A CORPORATION OF CONNECTICUT.

DUOR LOCK.

Application filed. March 30, 1923.

To all whom it may concern:

Be it known that I, NORMAN B. HURD, a citizen of the United States of America, residing at New Britain, Connecticut, have invented new and useful Improvements in a Door Look, of which the following is a specification.

My invention relates to new and useful improvements in door locks and latches.

My invention is of'particular utility when employed for doors of public buildings such as schoolhouses, office buildings, and the like, wherein it is desired that the entrance door or doors for the building shall be locked before and after certain hours, which look can be released only by the holders of a certain key which I will term the master key. In the case of a schoolhouse, each teacher may be equipped with a key which I will term a change key and which will permit the teacher to enter the building at any time and which will preferably permit the teacher to lock the door at any time. The keys employed are of the usual flat, pin cylinder type, and the master keys and change keys may be of'the same length. The construction is such that the lock may be applied to doors of different thicknesses without requiring any change in thelength of said keys or either of them, which is obviously a feature of conspicuous advan tage. In order that the lock may be applied to doors of different thicknesses, the pin cylinder lock portion is made adjustable as to length, but all of the keys will work the internal mechanism without any change in key length, even though the over-all length of the cylinder lock itself may be varied.

The foregoing and other advantages are attained, as will be understood by a mechanic skilled in the art, by a reading of the specification and an examination of the accompanying drawings, which illustrate my improvements in a preferred form.

In the drawings:

Fig. l is a side elevation of the lock mechanism including the latch and latch retracting means, the cover of the case being removed to expose the same to view.

Fig. 2 is a similar view, showing certain parts in a different position.

' liig. 3 is a view of the front or face of the lock.

Serial No. 628,793.

Fig. 4- is a section on the line 44 of Fig.

Fig. 5 is a section on the line 5-5 of Fig. 4, and relatively enlarged.

Figs. 6 and 7 are corresponding sectional views, the parts illustrated being in slightly different positions.

Fig. 8 is a sectional view of a detail.

. 1 represents a lock case. 2 represents the face plate of the lock. 3 is a retractable spring latch bolt of any well known type. tis the latch bolt tail. .5 is aspring for projecting the'latch. 6is a lever pivoted at 7 within .the lock case, the lever being of the bell crank type so that it may be lifted by a thumb-piece located at the outside of the door. 8 represents that part of the thumb-piece which projects under the lever 6. The upper end of the lever 6, in the particular form shown, directly engages the lower end of a pivoted lever 9, which in turn is located just in front of an abutment 1O on the end of the latch bolt tail 4. It follows that when the thumbpiece 8 is lifted, the lever 6 will be swung so that it will move back the end of the lever 9, which'in turn will engage the abutment 10 so as to retract the latch bolt head 3. By this means the latch may be operated from the outside, excepting when the latch bolt dog is in the on position. In Fig. 4, the parts are in a position to permit the latch bolt 3 to be retracted by the thumb piece 8. 11 is what I will term the latch dogging lever. This lever is pivoted to the case at 12, and the lower end is provided with a shoulder 13 which, when in the position shown. in Fig. 2, overstands a shoulder 14 on the lever 6 so that the latter cannot be lifted by the outside thumbpiece 8. 1 will presently describe how this dog is operated. The latch mechanism may be provided with the usual rollback 15, which is arranged to receive a spindle 16 having a knob (not shown) located at l side. This lever 18 is designed to be operated by a key controlled rollback 22 on the inner end of a cylinder lock mechanism which is accessible from the outside of the door and adapted to be attached to the lock case. In the particular form shown, there is an intermediate lever 23 between the said rollback 22 and the end 21 of the lever 18. Turning to Fig. 1, it will be seen that if the rollback 22 is turned to the right toward the dotted line position, it will engage the extension 20 and swing the lever 18 so that it will swing the dogging lever 11 (through the medium of the link 17) into the position shown in said Fig. 1, wherein the manually operable latch retracting lever 6 is free to be moved. On the other hand, if the rollback 22 is turned in the opposite direction as indicated in Fig. 2, said rollback will swing the lever 18 in an opposite direction (through the medium of the lever 23) and thereby shift the dogging lever 11 from the position shown in Fig 1 to that shown in Fig. 2, wherein the lever 6 will be dogged or blocked against movement so that the latch cannot be retracted from the outside by means of the thumb-piece 8.

The cylinder lock mechanism is such that the rollback 22 can be turned in both directions only by what I have termed the master key. This is accomplished in substantially the manner set forth in my former Patent No. 1,232,035, dated July 3, 1917, and hence need be only briefly described herein. In referring to Figs. 5} to 7, it will be seen that 24 represents the key rotatable plug of a pin cylinder lock. 25 represents a pin tumbler and 26 represents the follower portion of said tumble-r. As to this particular pin tumbler, one side of the pin passage in the plug is beveled or cut away as at 27; hence if the pin 25 is lifted by a key 28 (the change key) only to the degree shown in F 6, the plug may be turned in a counter clockwise direction, as shown therein, because the follower portion 26 will be forced up by the incline 27. The plug 242 cannot, however, be turned in a clockwise direction by the change key because it will not lift the pin 25 to the necessary degree. The master key is bitted so that this pin will be lifted to that degree necessary to free the plug so that it may be turned in both directions away from neutral.

Referring to Fig. 4-, it will be seen that the cylinder lock is adjustable as to length, and comprises two adjustable sections 2929 The rollback 22 is carried by the section 29 while the key plug 24: is carried by the section 29. The rollback and plug are suitably connected by sliding pins 30-3O so that even though the over-all length of the cylinder lock is varied the plug will always be operatively connected with the rollback. Thus, and because of the construction disclosed herein, the rollback may be operated by change and master keys of the same over-all length. 31 represents an adjusting screw, the head portion of which is carried by the section 29 the threaded portion screwing into a threaded piece 32 carried by the section 29. I have shown and described only one preferred means for changing the over-all length of the cylinder lock.

Now returning to Figs. 1 and 2, it will be noted that the lever 9, which is pivoted at 19, is provided with an extension 33 at one end only, this extension being located under the end of the lever 23. Thus the lever 9 performs onlythe function of retracting the latch 3 when swung by the rollback 22 through the medium of the lever 23, and this it will do at any time, even though the dogging mechanism is in the on position as shown in Fig. 2. The change key 28 may be turned in only that direction which will swing the lever 9 to retract the latch, but if the parts stand in the position shown in Fig. 1 and said key should be turned as stated, it will not only retract the latch 3 through the medium of the lever 9 but it will also shift the dogging lever 11 from the off position shown in Fig. 1 to the on position shown in Fig. 2. From the above, it follows that the holder of a change key may always use the key to retract the latch, even though the dogging mechanism is set in the on position, and the holder of such a key also has it within his or her power to set the dogging mechanism on, if it is desired to do so, simply by inserting the key on leaving the building and turning it in the latch retracting direction. Manifestly, when this is once done, the holder of a change key cannot throw off the dogging mechanism. This can be done only by the holder of a master key, and such a key is usually in charge of the janitor or superintendent of the building.

3e represents a lever pivoted at 35, the free end being forked to hav the two extensions -3637. 38 is an actuator pivoted in the face plate 2 of the lock. 39 is a spring pressed lever having a finger 4,0 which operates on the arm 37 when said lever is in one position to lift the lever 34. The arm 36, when the lever is lifted, rests just above the rear end of the latch bolt head 3 so that the latch may be freely retracted. When, however, the door is closed and the actuator 38 is held back by the strike plate, the rear end. of said actuator will engage the lever 39, pressing it back so as to remove the finger 40 from under the arm 37, whereupon the lever 34: will drop so that the arm 36 will stand behind the latch bolt 3. No novelty is claimed of this feature, but since it is illustrated as a part of the complete lock it is briefly referred to. Provision is made for lifting this lever 34 preparatory to retracting the latch 3 by a key or by the lever 6 or rollback 15. No novelty, however, is claimed of this feature, although the same is illustrated in the. drawings.

hat I claim is:

1. In a lock of the character described, in combination, a case, a normally projected retractable latch bolt, independent means for manually retracting said bolt from opposite sides of the. look, a dogging mechanism for one of said retracting means, a cylinder lock mechanism adapted to said case and having a single rollback operable by two differently bitted keys, means of connection be tween said single rollback and said dogging device for retracting the latch and also for throwing the dogging device on when said rollback is turned in one direction away from its neutral position by either of said keys and for throwing the dogging device off when said rollback is turned in an opposits direction away from neutral, with means to prevent said rollback from being turned in said opposite direction away from neutral by one of said keys, said means and said other key being constructed to permit said rollback to be turned away from neutral in both directions.

2. A lock possessing the combined features set forth in claim 1, with means of adjustment to vary the over-all length of said cylinder lock mechanism.

3. A look possessing the combined features set forth in claim 1, th means for preventing one of said keys from turning the rollback excepting in one direction away from neutral being contained in said cylinder lock mechanism.

1. A look possessing the combined features set forth in claim 1, with means for permitting the cylinder lock mechanism to be adjusted to .vary its over-all length, the means for preventing one of said keys from turning th rollback excepting in one direction away from neutral being contained in said cylinder lock mechanism. 1

NORMAN B. HURD. 

